Sending in an older unit is usually pretty costly, something like $280 + shipping or thereabouts if it's been long enough. If you're a real cheapskate like me, you can just sell your old unit (should bring anywhere from $200-$300+ unless it's truly ancient) and then buy a new one from V1 for either $400 or $360 for a returned unit (you have to call and ask for this).
I've done this a couple times and saved about $100-$150 each time. But for the hassle, probably worth it to just ship your old unit to V1.